qml: disable pay button while editing amount, perform minimum amount check for lightning invoices, update amount in invoice list.

electrum/gui/qml/components/InvoiceDialog.qml

@@ -14,6 +14,7 @@ ElDialog {
     property string invoice_key
 
     signal doPay
+    signal invoiceAmountChanged
 
     title: qsTr('Invoice')
     standardButtons: invoice_key != '' ? Dialog.Close : Dialog.Cancel
@@ -121,6 +122,29 @@ ElDialog {
                 }
             }
 
+            Label {
+                visible: invoice.invoiceType == Invoice.LightningInvoice
+                text: qsTr('Payment hash')
+                color: Material.accentColor
+            }
+
+            TextHighlightPane {
+                visible: invoice.invoiceType == Invoice.LightningInvoice
+
+                Layout.columnSpan: 2
+                Layout.fillWidth: true
+
+                padding: 0
+                leftPadding: constants.paddingMedium
+
+                Label {
+                    width: parent.width
+                    text: 'payment_hash' in invoice.lnprops ? invoice.lnprops.payment_hash : ''
+                    font.family: FixedFont
+                    wrapMode: Text.Wrap
+                }
+            }
+
             Label {
                 text: qsTr('Description')
                 visible: invoice.message
@@ -278,6 +302,7 @@ ElDialog {
                         onClicked: {
                             amountContainer.editmode = false
                             invoice.amount = amountMax.checked ? MAX : Config.unitsToSats(amountBtc.text)
+                            invoiceAmountChanged()
                         }
                     }
                     ToolButton {
@@ -308,7 +333,7 @@ ElDialog {
             Layout.fillWidth: true
             text: qsTr('Pay')
             icon.source: '../../icons/confirmed.png'
-            enabled: invoice.invoiceType != Invoice.Invalid && invoice.canPay
+            enabled: invoice.invoiceType != Invoice.Invalid && invoice.canPay && !amountContainer.editmode
             onClicked: {
                 if (invoice_key == '') // save invoice if not retrieved from key
                     invoice.save_invoice()

electrum/gui/qml/components/Invoices.qml

@@ -42,7 +42,12 @@ Pane {
                     id: delegateModel
                     model: Daemon.currentWallet.invoiceModel
                     delegate: InvoiceDelegate {
-                        onClicked: app.stack.getRoot().openInvoice(model.key)
+                        onClicked: {
+                            var dialog = app.stack.getRoot().openInvoice(model.key)
+                            dialog.invoiceAmountChanged.connect(function () {
+                                Daemon.currentWallet.invoiceModel.init_model()
+                            })
+                        }
                     }
                 }
 

electrum/gui/qml/components/LightningPaymentProgressDialog.qml

@@ -70,6 +70,7 @@ ElDialog {
     ColumnLayout {
         id: content
         anchors.centerIn: parent
+        width: parent.width
 
         Item {
             Layout.alignment: Qt.AlignHCenter
@@ -92,15 +93,18 @@ ElDialog {
 
         Label {
             id: helpText
+            Layout.alignment: Qt.AlignHCenter
             text: qsTr('Paying...')
             font.pixelSize: constants.fontSizeXXLarge
-            Layout.alignment: Qt.AlignHCenter
         }
 
         Label {
             id: errorText
-            font.pixelSize: constants.fontSizeLarge
+            Layout.preferredWidth: parent.width
             Layout.alignment: Qt.AlignHCenter
+            horizontalAlignment: Text.AlignHCenter
+            wrapMode: Text.Wrap
+            font.pixelSize: constants.fontSizeLarge
         }
     }
 

electrum/gui/qml/qeinvoice.py

@@ -16,6 +16,7 @@ from electrum.transaction import PartialTxOutput
 from electrum.util import (parse_URI, InvalidBitcoinURI, InvoiceError,
                            maybe_extract_lightning_payment_identifier)
 from electrum.lnurl import decode_lnurl, request_lnurl, callback_lnurl
+from electrum.bitcoin import COIN
 
 from .qetypes import QEAmount
 from .qewallet import QEWallet
@@ -226,6 +227,7 @@ class QEInvoiceParser(QEInvoice):
         self._logger.debug(str(lnaddr.get_routing_info('t')))
         return {
             'pubkey': lnaddr.pubkey.serialize().hex(),
+            'payment_hash': lnaddr.paymenthash.hex(),
             't': '', #lnaddr.get_routing_info('t')[0][0].hex(),
             'r': '' #lnaddr.get_routing_info('r')[0][0][0].hex()
         }
@@ -277,7 +279,11 @@ class QEInvoiceParser(QEInvoice):
         if self.invoiceType == QEInvoice.Type.LightningInvoice:
             if self.status in [PR_UNPAID, PR_FAILED]:
                 if self.get_max_spendable_lightning() >= self.amount.satsInt:
-                    self.canPay = True
+                    lnaddr = self._effectiveInvoice._lnaddr
+                    if self.amount.satsInt < lnaddr.amount * COIN:
+                        self.userinfo = _('Cannot pay less than the amount specified in the invoice')
+                    else:
+                        self.canPay = True
                 else:
                     self.userinfo = _('Insufficient balance')
             else: